DiTillio is a character in Alien: Sea of Sorrows, he is a mercenary and part of a freelance group hired by the Weyland-Yutani Corporation to capture a Xenomorph specimen.
Ditillio is captured along with Rodriguez and Joyce by a group of Xenomorphs, his next appearance in the book is when he wakes up to find himself cocooned, before he can get a grasp on what is going on, a Facehugger crawls up his body and attaches itself to his face. His death is not shown but it can be presumed he is killed by the emerging Chestburster